5.5 Fault Detection
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 219
Troubleshooting
5
Cause Possible Solution
The braking transistor is wired
incorrectly.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
Drive fails to operate properly due to
noise interference.
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control
circuit lines, main circuit lines and ground wiring.
Load inertia has been set incorrectly.
• Check the load inertia settings when using KEB, overvoltage suppression or
Stall Prevention during deceleration.
• Adjust L3-25 (Load Inertia Ratio) in accordance with the load.
Braking function is being used in
PM Open Loop Vector Control.
Connect a braking resistor.
Motor hunting occurs.
• Adjust the parameters that control hunting.
• Set the hunting prevention gain (n1-02).
• Adjust the AFR time constant (n2-02 and n2-03) when in Open Loop Vector
Control.
• Use parameters n8-45 (PM Speed Feedback Detection Suppression Gain) and
n8-47 (Pull-In Current Compensation Time Constant).
LED Operator Display Fault Name
PF
Input Phase Loss
Drive input power has an open phase or has a large imbalance of voltage
between phases. Detected when L8-05 = 1 (enabled).
Cause Possible Solution
There is phase loss in the drive input
power.
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
There is loose wiring in the drive
input power terminals.
• Ensure the terminals are tightened properly.
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Gauges and Tightening Torque on page 69
There is excessive fluctuation in the
drive input power voltage.
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• Disable Input Phase Loss Detection (L8-05 = “0”).
PF is detected if DC bus ripple is too high. If it is disabled, there is no fault but
the ripple is still too high, thereby the capacitors are stressed more and lose
lifetime.
There is poor balance between
voltage phases.
• Stabilize drive input power or disable phase loss detection. Notice: Disabling
phase loss detection may cause damage to the drive if input line power
conditions are not within specifications.
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